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1. 06:52 AM - Re: Engines-List Digest: 3 Msgs - 08/04/12 (john kent)
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| Subject: | Re: Engines-List Digest: 3 Msgs - 08/04/12 |
Just a thought, have you checked your fuel tank venting?
J.K. EI-DIY RV4.
>
> On Aug 3, 2012, at 6:55 PM, Speedy11@aol.com wrote:
>
>>
>> Engine gurus,
>> I have a problem with my engine that has me stumped. Maybe someone has seen
> this situation before or has an idea for resolution.
>> I have a Barrett IO-390 (essentially same as IO-360) that began missing and
losing
> power in June. I tracked down several "problems" which the solution to
> I thought would solve the power loss. I found one spark plug that seemed to
be
> a problem. Replaced all plugs and tested them before installation. Problem
> still there. Checked resistance in harness. All good. Replaced harness anyway.
> Problem still there. Sent P Mags back to factory for overhaul. Essentially
> have new P Mags now. Problem still there. Cleaned injectors and flow
> tested. Flows all equal. Cleaned fuel filter - nothing there. There is no air
> filter when I run ram air, so nothing to inhibit air flow. I checked the sniffle
> valve but no leak there.
>> On takeoff roll there seems to be slightly less power, but the power loss is
> more noticeable (approx 20% loss) once airborne. At pattern altitude with reduced
> power the engine runs ok. But as I add throttle (high RPM on prop) the engine
> loses power as if it is loading up. The EGTs and CHTs are normal. The
> RPM and MP are normal.
>> So, there you go. Any ideas?
>> Stan Sutterfield
>> RV-8A.
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